I have a sandisk I was using for my mac, however, it doesn't load up on the windows side. How do I format the USB within windows to run on windows? Thanks
Open "My Computer" and find the drive, probably E:\, right click on it and hit format. Make sure you use FAT32 and not NTFS.
If it does not show up in "My Computer" then you need to go to "Control Panel" -> "Administrative Tools" -> "Computer Management" -> "Disk Management" and find the drive, right click on it and hit format.
In OS X I'd just open Disk Utility and the rest is self explanatory.